VAN DER MERWE, Izak Johannes. Happiness – a primer for theological engagement. Stellenbosch Theological Journal, [S. l.], v. 1, n. 1, p. 291–319, 2015. DOI: 10.17570/stj.2015.v1n1.a15. Disponível em: https://ojs.reformedjournals.co.za/index.php/stj/article/view/24. Acesso em: 19 oct. 2025.